Fairchild C-123 Provider

The crew was completing a local training mission at Duke Field, Florida. Following several touch-and-go manoeuvres, the crew completed a circuit at low height to start a new approach when, during a last turn, the airplane stalled and crashed in flames half a mile short of runway threshold. The airplane was destroyed and all four crew members were killed.

Crashed in unknown circumstances 87 km south from Buôn Ma Thuột, South Vietnam. All five crew members were rescued.

As the aircraft was about to take off for its return flight to Phan Rang, the pilot saw a huge thunderstorm directly in its path and decided to abort the flight. He was observed to taxi along the runway to return to the parking area and had covered about 2,000 feet when the tower warned him to clear the runway immediately. However, before the Provider could turn off the runway it was hit by a Thunderchief as it landed in poor visibility. The F-105's starboard wing sliced through the left side of the C-123's fuselage and the jet's fuselage tore off both the Provider's engines from its port wing. The Thunderchief pilot died in the collision and the burning aircraft tumbled down the runway for another 5,000 feet. All the C-123 crew escaped with burns, although one of them died from his injuries few days later.
Source: Chris Hobson

The crew was completing a flight from Biên Hòa to Nha Trang with an intermediate stop at Bảo Lộc. While on approach, the pilot-in-command failed to realize his altitude was insufficient when the airplane struck the slope of a wooded mountain located some 19 km southwest of Bảo Lộc Airport. The aircraft was destroyed and all 11 occupants were killed.
Crew:
Lt Col Merle Deane Turner,
Cpt Edward Louis Goucher,
A1C james Russell Mayo.

While flying at a height of 150 feet on a supply mission, the airplane was hit by enemy artillery and crashed in flames in a dense wooded area. All five crew members were killed.
Crew:
Lt Col Everett Edward Foster,
Maj Allan Julius Stearns,
Maj Donald Thomas Steinbrunner,
S/Sgt Irvin Grant Weyandt,
Sgt Le Tan Bo.

The crew was engaged in a local training flight and was supposed to complete touch-and-go maneuvers. After touchdown, the pilot-in-command increase the engine power to takeoff when the airplane went out of control, veered off runway and came to rest. All four crew members escaped uninjured while the aircraft was damaged beyond repair.

On touchdown at Saigon-Tan Son Nhat Airport, the nose gear collapsed. The airplane slid on runway for several yards before coming to rest. All five crew members were uninjured while the aircraft was considered as damaged beyond repair.

While on defoliation mission, the airplane was shot down by enemy fire and crashed 8 km southwest of Xepon. All five crew members were killed.
Crew:
Cpt Roy Robert Kubley,
Maj Lloyd Francis Walker,
Cpt Harvey Mulhauser,
Lt Howard Leroy Barden,
A1C Ronald Kazuo Miyazaki.

Crashed in unknown circumstances in South Vietnam, injuring all five crew members.

The aircraft was engaged in a paradropping mission, carrying 35 paratroopers and two pilots. Shortly after takeoff from Dầu Tiếng Airport, while in initial climb, the airplane was hit by enemy fire. Hydraulic lines were ruptured and the fluid caught fire. The crew was able to make a circuit to return for an emergency belly landing. The airplane belly landed and came to rest onto runway. All 37 occupants were slightly injured and the aircraft was damaged beyond repair.